slater



F. M. SL'ATER. Y SUIPORT FOR ROYTATING S-TD'PE DRJLLS.

' APPLICATION FILED mnmvzz. |920.

Patented June-21', 1921.

I ENTOR. www( .MJ

BY v

'A'owzmf CIK FRED M. SLATER, 0F EASTON, lgENNsLvflA, ASSIGNOR TO INGERSiL-RAND COMPANY, OF JERSEY CITY,

NEW' JERSEY, A CORPORATIN OF N t JERSEY.

SUPPORT FOR RTATENG- STOPE-DRILLS.

Specification of Letters Fatent. Patiqgntd Jug@ 21, QQL

Application le March 22, i920. Serial No. 367,831.

To all 107mm t may concern Be it known that l, FRED M. SLArnn, a citizen of the United States, residing at Easton, in the county of Northampton and State of Pennsylvania, have invented a certain new and useful Improvement in Sup ports for Rotating Stope-Drills, of which the following is a specification.

This invention relates to a noirrotating support or foot for rock drills, more particularly rotating stope drills having a fluid operated feeding element which may be in the forni of an air feed cylinder. ln the type of drill selected for illustration of the invention, independent means are preferably provided for rotating the drill bit.

When the drill bit sticks in operation, or becomes jammed, the drill cylinder and the entire tool tend to rotate in the opposite direction to that in which the drill bit was rotating, and the primary object of the present invention is to enable the entire drill to be firmly supported upon a foot piece and operated with independent rotation and air feed, but to afford means for preventing the drill cylinder from rotating.

The rock gripping foot or foot piece which supports the tool is constructed in an improved manner adapted to strongly resist backward rotation of the machine, without slipping on the rock and the air feed element comprising two telescopic members in slidable but relatively non-rotatable engagement is pivotally but non-rotatably supported upon the foot piece.

The drawings illustrate a preferred form of the invention in which- Figure l is a side elevation partly broken away and partly in vertical section showing a rock drill embodying my invention,

Fig. 2 is an enlarged detail transverse sectional view on the line 2-2 of F ig. i, and

IFig. 3 is an enlarged detail perspective view of the foot piece and air feed piston rod partly broken away.

Referring to the drawings, A represents the cylinder casing of a stope drill of the percussive type, having the air feed cylinder B and any suitable or usual construction of front head U, adapted to receive the rotating drill bit D. A suitable rotation motor for rotating the drill bit may be mounted on the tool, in this instance the motor casing being indicated at E. Fluid pressure .is admitted to the tool at the inlet F and til@ usual throttle valve is indicated at (l for controlling the admission of Afluid pressure to the drill cylinder and to tl c feed c"'linder. A handle l may also be provided adapted to be grasped by the operator. rhe front head o is held to the drill cylinder by the usual spring pressed side bolts J as show lThe feed cylinder li telescopes over. and slides upon ay piston (not shown) and piston rod K, and in order to restrain the feed cylinder from rotating relatively to the piston rod K, these two members have slidable but relatively non-rotatable engagement. In this instance and as a convenient construction, the piston rod K is longitudinally grooved at L and the end of the feed cylinder B is provided with longitudinal ribs or tongues i) adapted to engage the grooves L and prevent the feed cylinder from turning when the piston rod l. is held from turning.

A non-rotating transversely extending rock engaging foot or foot piece Q is trans- Versely pivoted or swiveled at on the end of the piston rod K. ln this instance the end of the piston rod l is split or grooved at S and the body of the foot piece is inserted in the groove S and the pivot pin inserted in position. The foot piece Q is provided with rock engaging points or toes T at each end which are preferably beveled to forni sharp edges and these points or toes T extend rearwardly from the foot piece and outwardly at each side at opposite angles to the plane of the foot piece in directions to resist any tendency of the drill cylinder casing and feeding element to bodily rotate backwardly in the reverse direction to the rotation of the drill steel. The toes T preferably point in the proper direction and at the required angle to resist the tendency of the entire tool to rotate, and for this purpose the toes are forwardly inclined in the direction which the tool would tend t0l rotate, so that the toes dig into the rock and prevent such rotation. @bviously the feed cylinder B and piston rod K may be reversed end for end as is frequently done in practice, in which case the foot piece would be attached to the outer end of the cylinder B and the drill casing would be attached to the end of the piston rod.

I claiml. In a fluid actuated rock drill, the combination of a drill cylinder casing provided with automatic rotationlor tlie drill steel, a lluid operated feeding element comprising tivo telescopic members in slidable but relatively non-rotatable engagement, tbe drill cylinder casing being rigidly mounted on one member or' the feeding element, and a non-rotating support transversely pivoted to the other member of the feeding element, said support comprising a transversely eX- tending pivotal foot piece provided with beveled and sliaipemedv rock engaging toesat each end extending rearwardly from the root piece and outwardly at each side at opposite angles to the plane of tbe foot piece in directions to reeietV any tendency of the drill cylinder and 'feeding element to bodily rotate backwardly' in the reverse direction to the rotation of the drill steel.

`2. ln a fluid actuated roclrdrill, the combination o1 a drill cylinder easing provided With automatic rotation for the drill steel, a fluid operated feeding element comprising toet piece and outwardly beyondtlie endsA of the 'foot piece in opposite directions andV also extending outwardly at each side at 0pposite angles to the plane or tbe foot piece in directions to resist anytendency of the drill cylinder and feeding element to bodily rotate backwardly in the reverse direction to the rotation of the drill steel. v Y

lntestimony vvliereolyl llave hereunto set my band.

FRED. M. sLATnRj 

